Question

matlab求带参数二元方程组求得解中依然含未知数

其中求解T和t1 得出结果中依然存在未知数，求解惑
syms P C a k t1 Pm a1 b1 g1 T l Cm Cw Pr g t0 x e1 e2 x
[T,t1]=solve('P*k - C*k - Cm*a + 2*a*g + C*a*g1 + T*a*a1 - 2*Cm*k*t1 - g*k*t0 + 4*g*k*t1 + 2*C*g1*k*t1 + 2*T*a1*k*t1=0','a1*t1*(a + k*t1) - 2*T=0')

T =

(P*k - C*k - Cm*a + 2*a*g + C*a*g1 + T*a*a1)/(g*k) - ((a + ((a1*a^2 + 8*T*k)/a1)^(1/2))*(2*g - Cm + C*g1 + T*a1))/(g*k)
(P*k - C*k - Cm*a + 2*a*g + C*a*g1 + T*a*a1)/(g*k) - ((a - ((a1*a^2 + 8*T*k)/a1)^(1/2))*(2*g - Cm + C*g1 + T*a1))/(g*k)

t1 =

-(a + ((a1*a^2 + 8*T*k)/a1)^(1/2))/(2*k)
-(a - ((a1*a^2 + 8*T*k)/a1)^(1/2))/(2*k)

Answer 1

因为你没有指定求解变量，所以得到结果就会这样。将solve（）改成如下形式，就okl了。

[T,t1]=solve('P*k - C*k - Cm*a + 2*a*g + C*a*g1 + T*a*a1 - 2*Cm*k*t1 - g*k*t0 + 4*g*k*t1 + 2*C*g1*k*t1 + 2*T*a1*k*t1=0','a1*t1*(a + k*t1) - 2*T=0','T','t1')

求解结果为